/**
 *
 * Copyright (c) 2006-2017, Speedment, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); You may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.speedment.generator.standard.internal.util;

import com.speedment.generator.translator.component.TypeMapperComponent;
import com.speedment.runtime.config.Column;
import com.speedment.runtime.config.trait.HasNullable;
import java.lang.reflect.Type;
import java.util.Optional;

/**
 *
 * @author Emil Forslund
 */
public final class ColumnUtil {
    
    public static boolean usesOptional(Column col) {
        return col.isNullable() 
            && HasNullable.ImplementAs.OPTIONAL == col.getNullableImplementation();
    }
    
    public static Optional<String> optionalGetterName(TypeMapperComponent typeMappers, Column column) {
        final Type colType = typeMappers.get(column).getJavaType(column);
        final String getterName;
        
        if (usesOptional(column)) {
            if (Double.class.getName().equals(colType.getTypeName())) {
                getterName = ".getAsDouble()";
            } else if (Integer.class.getName().equals(colType.getTypeName())) {
                getterName = ".getAsInt()";
            } else if (Long.class.getName().equals(colType.getTypeName())) {
                getterName = ".getAsLong()";
            } else {
                getterName = ".get()";
            }
        } else {
            return Optional.empty();
        }
        
        return Optional.of(getterName);
    }
    
    /**
     * Utility classes should not be instantiated.
     */
    private ColumnUtil() {
        throw new UnsupportedOperationException();
    }
}